CN107192810B - The three-dimensional multi-functional experiment porch and test method of mining overburden fracture pattern and motion feature - Google Patents
The three-dimensional multi-functional experiment porch and test method of mining overburden fracture pattern and motion feature Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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Abstract
The three-dimensional multi-functional experiment porch and test method of a kind of mining overburden fracture pattern and motion feature.It is used suitable for coal science research field.Including test desk body and the rock simulation device being arranged in above test desk body.The position that all horizontal pumping boards and crossbeam are arranged on vertical lift plate forms simulation floor undulation, props up vertical lift plate with jack and withstands simulation floor undulation；Successively horizontal pumping board is extracted out certain distance outward since bracket one end, to simulate the face width exploited under overlying strata, and out horizontal pumping board is extracted to the simulation advance of the face outward by sequence, all horizontal pumping boards exhaust, it is simple that working face mining under simulation overlying strata finishes its structure, it is easy to use, can key stratum space-time fracture pattern and motion feature of the analog study mining overburden under the conditions ofs difference adopts wide, mining height and buried depth etc., provide reliable physical analogy model and method for the influence of pattern and motion feature to stope mine pressing that is broken of research mining overburden.
Description
Technical field
The present invention relates to a kind of similar physics simulation experiment platform of three-dimensional strata movement more particularly to mining overburden fracture types
The three-dimensional multi-functional experiment porch of formula and motion feature, belongs to field of coal mining.
Background technique
In order to better ensure that the safety in production of underground mine, to the maximum extent exploit mineral resources, protection environment of mining area
And ground installation, it is necessary to grasp mine pressure and rock stratum mechanics, this is one of most basic research of mining subject.
With the development of mining engineering subject, gradually formed during studying mine pressure and rock movement is regular
Numerical simulation, three kinds of research methods of physical analogy and field measurement.Wherein the field measurement intrinsic period is longer, it is a large amount of to expend
Human and material resources, limited that serious, limitation is big by field condition；The existing measuring instrument in mine has a single function, or is only capable of obtaining
Stope space local data need to carry out reasonable theory analysis and hardly result in verifying to region is not surveyed；And introducing other necks
The severe working environment of underground coal mine is considered during the advanced instrument in domain, and being up to the present still one could not solve very well
The problem of.Rock mass stress point after the numerical simulation of mining aspect is adopted since the limitation of software is also difficult to accurately handle at present
The evolution process that cloth, large deformation be mobile to be destroyed, emit backward physical property variation etc., shortage true original necessary to being accurately calculated
Rock stress field, the basic datas such as true rock mass physical mechanics parameter, calculated result also just can not often simulate legitimate reading.And
When carrying out research Overlying Strata In A Face rupture, inbreak and movement law and key stratum fracture rule, similar physical analogy is real
Testing becomes a kind of generally acknowledged feasible research means.
Currently, similarity simulation experiment both domestic and external is mostly two-dimensional analog experiment, model boundary condition is made very big
Simplify, often also there is larger differences with actual conditions for analog result, while can not also observe a certain layer rock stratum and adopt
Space fracture characteristicss in journey.Some scholars also study three-dimensional similar simulation experimental platform, but to operational parameter
Such as working face face is wide, the control of mining height, buried depth is relatively simple.Therefore, it is necessary to which operational parameter can freely be adjusted by inventing one kind
Research mining overburden fracture pattern and motion feature three-dimensional physical simulation experiment porch, the fracture of rear overlying strata is adopted in research work face
The migration characteristics of structure, delamination analog material rock stratum, emphasis disclose each key stratum of overlying strata from top to bottom after model exploitation
The occurrence of flat cutting faces crack, then the spatial correspondence of all previous fracture structure of three-dimensional reconstruction distance field key stratum；By at coal seam bottom
Plate presses position and strength condition throughout pressure monitor system, with reflect working face.
Summary of the invention
In order to overcome the shortcoming of technology, present invention offer structure is simple, easy to use, can not only obtain stope overlying strata
Be broken pattern and motion feature, and the mining overburden that can simulate multiple mining scene is broken the three-dimensional more of pattern and motion feature
Functional experiment platform.
To achieve the goals above, the three-dimensional multi-functional experiment of mining overburden of the invention fracture pattern and motion feature is flat
Platform, including test desk body and the rock simulation device being arranged in above test desk body:
Test desk body includes bracket, and bracket side opposite side is equipped with two pieces of fixed cross beams, and the middle and lower part of two sides fixed cross beam is welded
Tape splicing has the bracket of screw hole, and bracket other side opposite side is equipped with two pieces of wide clamping plates, and fixed cross beam and wide clamping plate are by being welded on bracket
Four frame bodies of upper formation, be equipped with below bracket with the matched vertical lift plate of bracket area, be vertically moved up or down on plate and be laterally placed with
Multiple horizontal pumping boards are vertically moved up or down the corner location below plate and are equipped with short support column, and laterally arrangement is solid in pairs for the horizontal pumping board of multiple groups
It is scheduled in wide clamping plate, convenient for extraction outward, is longitudinally equipped with additional horizontal beams between pairs of horizontal pumping board；
Rock simulation device include for make simulation rock stratum mold, bracket include four pieces mutually splice and combine it is vertical
Thin plate, buried depth simulator include airbag, are equipped with muti-piece transparent panel, area and the cradle top phase of muti-piece transparent panel above airbag
Matching.
Horizontal pumping board is " I " fonts.Airbag and transparent panel use PVC transparent material.The support of two sides fixed cross beam middle and lower part
The both ends of frame, bracket and additional horizontal beams are secured with nuts.The coboundary of thin plate is equipped with the screw hole that can be connect with three pieces of transparent panels,
And it is bound using nut connection.
A kind of mining overburden fracture pattern and motion feature test method, its step are as follows:
The position shape of all horizontal pumping boards and crossbeam is set on vertical lift plate according to the exploitation face structure of simulation
At simulation floor undulation, vertical lift plate is propped up with jack and withstands simulation floor undulation；
Sand, calcium carbonate, gypsum and water are mixed in proportion, the structure for simulating tested rock stratum is uniformly laid on simulation
On floor undulation, simulate the top plate of tested rock stratum bottom analog coal working face, wait simulate tested rock stratum it is stiff after will not fill
The airbag of gas is covered on the tested rock stratum of simulation, and muti-piece transparent panel is secured with nuts and is sealed on vertical thin to bracket
Top；
It is inflated using air pump into airbag, is in contact, protects with the vertical thin and transparent panel being connected after airbag expansion
The state that is squeezed for holding airbag simulates the uniform load lasting to rock stratum coboundary；
It needs to control vertical lift plate by jack according to test and declines certain altitude, simulate relevant work face mining height,
The mining height simulated at this time is vertical lift the sum of plate falling head and horizontal pumping board thickness, successively will be horizontal since bracket one end
Pumping board extracts certain distance out outward, to simulate the face width exploited under overlying strata, and by sequence that horizontal pumping board is outside
The extraction simulation advance of the face, with the propulsion of simulation working face, when the outstanding product of showing up of the top plate for simulating tested rock stratum bottom analog
It when reaching a certain level, simulates tested rock stratum and is from bottom to top successively broken, fracture range is successively successively decreased, fracture height and rock
Layer fracture angle and position of key stratum it is related, and so on until all horizontal pumping boards exhaust, simulate overlying strata under working face mining
It finishes；
All horizontal pumping boards are arranged in pairs on vertical lift plate, and horizontal pumping board is aligned formation one completely inwardly
Plane, thus constitute single stope exploitation when simulation floor undulation.
Additional horizontal beams and the bracket of bracket two sides are connected and fixed with bolt, rising vertical lift plate makes to be vertically moved up or down plate top
Portion is contacted with additional horizontal beams, is arranged in pairs horizontal pumping board in the wide clamping plate of bracket two sides, makes top surface and the level of additional horizontal beams
The inner opposite end of horizontal pumping board is taken and is set at the long side edge of additional horizontal beams in same level height by the bottom surface of pumping board, overlap joint
Portion outboard one end is clipped in wide clamping plate, and horizontal pumping boards all at this time constitute two of the intermediate groove for being separated with additional horizontal beams formation
Working face coal seam is simulated, bottom portion of groove is the top surface exposed part of additional horizontal beams, according to the likelihood ratio of coal seam parameter by sand, carbon
Sour calcium, gypsum and water are stirred, and mixture is filled up groove, so that horizontal pumping board and mixture is formed one and are completely put down
Face, the mixture in further groove simulate the coal column for staying and setting between two neighboring working face.
Control jack control vertical lift plate falling head h1, simulate relevant work face mining height, the mining height simulated at this time
For height h1In addition simulation floor undulation horizontal pumping board thickness, since bracket one end by pairs of horizontal pumping board respectively to
Two sides extract same distance out, if the horizontal pumping board extracted out first to two sides is a plate and b plate, if a plate extracts 1m out outward, b plate is outside
Extract 1m out, then simulating the single face width exploited under overlying strata is 2m, and second group of horizontal pumping board c plate and d plate are taken out to two sides
Identical distance out, and so on, until all horizontal pumping boards exhaust, simulating width under overlying strata is that the single working face of 2m is opened
It adopts and finishes.
Plate falling head h will be vertically moved up or down with jack2, the mining height simulated at this time is h2In addition horizontal pumping board and additional
The thickness of crossbeam is then successively extracted the horizontal pumping board on same one side out since bracket one end, outward if taking out outward first
Preceding two pieces of horizontal pumping boards out are a plate and c plate, as a plate extracts 1m, i.e., the single face width exploited under simulation overlying strata out outward
For 1m, then extract c plate out 1m outward, and so on, until the horizontal pumping board on same one side is exhausted, simulating width under overlying strata is
The single working face mining of 1m finishes, if preceding two pieces of horizontal pumping boards for extracting out to exterior measuring of another side are b plate and d plate, first by b plate to
Outer extraction 1m, i.e., second face width exploited under simulation overlying strata is 1m, then extracts d plate out 1m outward, and so on, directly
Horizontal pumping board to another side exhausts, and simulating width under overlying strata is that the two neighboring working face mining of 1m finishes.
The utility model has the advantages that
1, a variety of distances are extracted to two sides to control simulation face width by the horizontal pumping board of same position, retains simulation and opens
The working face boundary coal column adopted, solve existing three-dimensional similar simulation experimental device control face width it is single, without boundary
Not the problem of coal column and actual conditions are not inconsistent；
2, previous hydraulic, mechanical pressurization traditional mode is changed using air bag pressing device, may be implemented disconnected in rock stratum
Still guarantee the downward uniform load of vertical-dipping bed in the case where splitting sinking, and three pieces of top transparent panel selects PVC saturating with airbag
The dynamic process of fracture can be observed in real time in bright material, and structure is simple, and material is easy to get；
3, by increasing, an additional horizontal beams realization exploits overlying strata fracture pattern from analog study single stope and movement is special
Sign is converted to the two neighboring working face of analog study and successively exploits overlying strata fracture pattern and motion feature, clever structure, operation side
Just.
Detailed description of the invention
Fig. 1 is the structural representation of the three-dimensional multi-functional experiment porch of mining overburden fracture pattern of the present invention and motion feature
Figure；
Fig. 2 is that the bracket of the three-dimensional multi-functional experiment porch of mining overburden fracture pattern of the present invention and motion feature is overlooked
Figure；
Fig. 3 is the bracket left view of the three-dimensional multi-functional experiment porch of mining overburden fracture pattern of the present invention and motion feature
Figure；
Fig. 4 is the bracket main view of the three-dimensional multi-functional experiment porch of mining overburden fracture pattern of the present invention and motion feature
Figure.
In figure: 1- bracket, 2- fixed cross beam, 3- wide clamping plate, the horizontal pumping board of 4-, 5- are vertically moved up or down plate, the short support column of 6-, 7-
Bracket, 8- vertical thin, 9- airbag, 10- transparent panel, 11- additional horizontal beams.
Specific embodiment
One embodiment of the present of invention is further described with reference to the accompanying drawing:
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, the three-dimensional multi-functional of mining overburden of the invention fracture pattern and motion feature
Experiment porch includes the rock simulation device testing desk body and being arranged in above test desk body:
Wherein test desk body includes bracket 1, and 1 side opposite side of bracket is equipped with two pieces of fixed cross beams 2, two sides fixed cross beam 2
Middle and lower part welding has the bracket 7 of screw hole, and 1 other side opposite side of bracket is equipped with two pieces wide clamping plate 3, and fixed cross beam 2 and wide clamping plate 3 are logical
It crosses to be welded on bracket 1 and forms four frame bodies, the vertical lift plate 5 area matched with bracket 1 is equipped with below bracket 1, it is vertical to rise
Multiple horizontal pumping boards 4 are laterally placed on drop plate 5, horizontal pumping board 4 is " I " fonts, the corner location of 5 lower section of vertical lift plate
Equipped with short support column 6, laterally arrangement is fixed in wide clamping plate 3 the horizontal pumping board 4 of multiple groups in pairs, convenient for extraction outward, pairs of water
Additional horizontal beams 11, the bracket 7 of 2 middle and lower part of two sides fixed cross beam, bracket 7 and additional horizontal beams 11 are longitudinally equipped between flat pumping board 4
Both ends are secured with nuts；
Rock simulation device include for make simulation rock stratum mold, bracket include four pieces mutually splice and combine it is vertical
Thin plate 8, buried depth simulator include airbag 9, are equipped with muti-piece transparent panel 10, the area and branch of muti-piece transparent panel 10 above airbag 9
Top of the trellis matches, and the coboundary of thin plate 8 is equipped with the screw hole that can be connect with three pieces of transparent panels 10, and uses nut connection envelope
Top, airbag 9 and transparent panel 10 use PVC transparent material.
The test method of a kind of mining overburden fracture pattern and motion feature, its step are as follows:
The position of all horizontal pumping boards 4 and crossbeam 11 is set on vertical lift plate 5 according to the exploitation face structure of simulation
It sets to form simulation floor undulation, vertical lift plate 5 is propped up with jack and withstands simulation floor undulation；
Sand, calcium carbonate, gypsum and water are mixed in proportion, the structure for simulating tested rock stratum is uniformly laid on simulation
On floor undulation, analogsimulation be tested rock stratum bottom analog coal working face top plate, wait simulate tested rock stratum it is stiff after will
The airbag 9 of unaerated is covered on the tested rock stratum of simulation, and muti-piece transparent panel 10 is secured with nuts on vertical thin 8 to branch
Frame binds；
It is inflated using air pump into airbag 9, airbag 9 connects after expanding with the vertical thin 8 and transparent panel 10 being connected
Touching keeps the state that is squeezed of airbag 9 to simulate the uniform load lasting to rock stratum coboundary；
It needs to control jack control vertical lift plate 5 according to test and declines certain altitude, simulate relevant work face mining height,
The mining height simulated at this time is vertical lift the sum of 5 falling head of plate and 4 thickness of horizontal pumping board, successively by water since bracket one end
Flat pumping board 4 extracts certain distance out outward, to simulate the face width exploited under overlying strata, and by sequentially by horizontal pumping board 4
The extraction simulation advance of the face outward, with the propulsion of simulation working face, when the outstanding dew of the top plate for simulating tested rock stratum bottom analog
It when area reaches a certain level, simulates tested rock stratum and is from bottom to top successively broken, fracture range is successively successively decreased, fracture height
With rock stratum be broken angle and position of key stratum it is related, and so on until all horizontal pumping boards 4 exhaust, simulate overlying strata under working face
Exploitation finishes；
When simulation single stope Exploitation research mining overburden fracture pattern and movement: all horizontal pumping boards 4 are arranged in pairs
On vertical lift plate 5, and horizontal pumping board 4 is aligned forms a complete plane inwardly, to constitute single stope exploitation
When simulation floor undulation；Control jack control vertical lift 5 falling head h of plate1, relevant work face mining height is simulated, this
When the mining height simulated be height h1In addition 4 thickness of horizontal pumping board of simulation floor undulation, it will be pairs of since bracket one end
Horizontal pumping board 4 respectively to two sides extract out same distance, if first to two sides extract out horizontal pumping board 4 be a plate and b plate, as a plate to
Outer extraction 1m, b plate extract 1m out outward, then simulating the single face width exploited under overlying strata is 2m, by second group of horizontal pumping board
4c plate and d plate extract identical distance out to two sides, and so on, until all horizontal pumping boards 4 exhaust, simulate width under overlying strata
It is finished for the single working face mining of 2m.
Simulated dual working face mining study mining overburden fracture pattern and movement when: with bolt by a width be 25 centimetres
Additional horizontal beams 11 and 1 two sides of bracket bracket 7 be connected and fixed rise vertical lift plate 5 make to be vertically moved up or down the top of plate 5 with it is additional
Crossbeam 11 contacts, and horizontal pumping board 4 is arranged in pairs in the wide clamping plate 3 of 1 two sides of bracket, takes out the top surface of additional horizontal beams 11 and level
The inner opposite end of horizontal pumping board 4 is taken and is set at the long side edge of additional horizontal beams 11, is taken in same level height in the bottom surface of plate 4
Connecing partial-length is about 2.5 centimetres, and lateral ends are clipped in wide clamping plate 3, horizontal pumping boards 4 all at this time constitute centre be separated with it is additional
Two simulation working face coal seams of the groove that crossbeam 11 is formed, bottom portion of groove are the top surface exposed part of additional horizontal beams 11, groove
Width is 20 centimetres.Sand, calcium carbonate, gypsum and water are stirred according to the likelihood ratio of coal seam parameter, and mixture is filled out
Full groove makes horizontal pumping board 4 form a complete plane with mixture, and the mixture in further groove is simulated two neighboring
The coal column set is stayed between working face；5 falling head h of plate will be vertically moved up or down with jack2, the mining height simulated at this time is h2In addition
The thickness of horizontal pumping board 4 and additional horizontal beams 11 then successively takes out the horizontal pumping board 4 on same one side since bracket one end outward
Out, it if the first two pieces horizontal pumping boards 4 extracted out outward first are a plate and c plate, if a plate extracts 1m out outward, i.e., is opened under simulation overlying strata
The single face width adopted is 1m, then extracts c plate out 1m outward, and so on, until the horizontal pumping board on same one side is exhausted,
Simulating width under overlying strata is that the single working face mining of 1m finishes, if the first two pieces horizontal pumping boards 4 that another side is extracted out to exterior measuring
For b plate and d plate, first extract b plate out 1m outward, i.e., second face width exploited under simulation overlying strata is 1m, then by d plate to
Outer extraction 1m, and so on, until the horizontal pumping board of another side exhausts, simulate the two neighboring work that width under overlying strata is 1m
Face exploitation finishes.
Claims (9)
1. the three-dimensional multi-functional experiment porch of a kind of mining overburden fracture pattern and motion feature, it is characterised in that: it includes examination
The rock simulation device testing desk body and being arranged in above test desk body:
Test desk body includes bracket (1), and bracket (1) side opposite side is equipped with two pieces of fixed cross beams (2), two pieces of fixed cross beams (2)
Middle and lower part welding have screw hole bracket (7), bracket (1) other side opposite side be equipped with two pieces wide clamping plate (3), fixed cross beam (2) and
Wide clamping plate (3) forms four frame bodies by being welded on bracket (1), is equipped with below bracket (1) and bracket (1) is area matched hangs down
Straight lifter plate (5), is vertically moved up or down on plate (5) and is laterally placed with multiple horizontal pumping boards (4), the quadrangle below vertical lift plate (5)
Position is equipped with short support column (6), and laterally arrangement is fixed in wide clamping plate (3) the horizontal pumping board of multiple groups (4) in pairs, convenient for taking out outward
Out, additional horizontal beams (11) longitudinally are equipped between pairs of horizontal pumping board (4)；
Rock simulation device includes the mold for making simulation rock stratum, and bracket includes four pieces of vertical thins mutually spliced and combined
(8), buried depth simulator includes airbag (9), is equipped with muti-piece transparent panel (10) above airbag (9), the face of muti-piece transparent panel (10)
Product matches with cradle top;
Horizontal pumping board (4) is " I " fonts.
2. the three-dimensional multi-functional experiment porch of mining overburden fracture pattern according to claim 1 and motion feature, special
Sign is: airbag (9) and transparent panel (10) use PVC transparent material.
3. the three-dimensional multi-functional experiment porch of mining overburden fracture pattern according to claim 1 and motion feature, special
Sign is: the bracket (7) of two pieces of fixed cross beam (2) middle and lower parts, bracket (7) and the both ends of additional horizontal beams (11) are secured with nuts.
4. the three-dimensional multi-functional experiment porch of mining overburden fracture pattern according to claim 1 and motion feature, special
Sign is: the coboundary of thin plate (8) is equipped with the screw hole that can be connect with three pieces of transparent panels (10), and is bound using nut connection.
5. a kind of examination using the fracture pattern of mining overburden described in claim 1 and the three-dimensional multi-functional experiment porch of motion feature
Proved recipe method, it is characterised in that steps are as follows:
Horizontal pumping board (4) and additional horizontal beams are set on vertical lift plate (5) according to the geological conditions of simulation test working face
(11) position forms simulation floor undulation, props up vertical lift plate (5) with jack and withstands simulation floor undulation；
Sand, calcium carbonate, gypsum and water are mixed in proportion, the structure for simulating tested rock stratum is uniformly laid on simulation work
On the bottom plate of face, wait simulate tested rock stratum it is stiff after the airbag (9) of unaerated is covered on the tested rock stratum of simulation, muti-piece is saturating
Isotropic disk (10), which is secured with nuts, binds to bracket on vertical thin (8)；
Using air pump to inflation in airbag (9), after airbag (9) expansion with the vertical thin (8) and transparent panel (10) that are connected
It is in contact, the state that is squeezed of airbag (9) is kept to simulate the uniform load lasting to rock stratum coboundary；
It needs to control vertical lift plate (5) by jack according to test and declines certain altitude, simulate relevant work face mining height, this
When the mining height simulated be vertical lift the sum of plate (5) falling head and horizontal pumping board (4) thickness, successively will since bracket one end
Horizontal pumping board (4) extracts certain distance out outward, to simulate the face width exploited under overlying strata, and is taken out level by sequence
Plate (4) the extraction simulation advance of the face outward, with the propulsion of simulation working face, when the top plate for simulating tested rock stratum bottom analog
It when outstanding product of showing up reaches a certain level, simulates tested rock stratum and is from bottom to top successively broken, fracture range is successively successively decreased, and is broken
Height with rock stratum be broken angle and position of key stratum it is related, and so on until all horizontal pumping boards (4) exhaust, simulate overlying strata under
Working face mining finishes.
6. test method according to claim 5, it is characterised in that simulation single stope Exploitation research mining overburden fracture
When pattern and movement: horizontal pumping board (4) being arranged in pairs on vertical lift plate (5), and horizontal pumping board (4) is aligned shape inwardly
At a complete plane, to constitute simulation floor undulation when single stope exploitation.
7. test method according to claim 5, it is characterised in that simulated dual working face mining studies mining overburden fracture
When pattern and movement: being connected and fixed additional horizontal beams (11) and the bracket (7) of bracket (1) two sides with bolt, rise vertical lift
Plate (5) makes to be vertically moved up or down at the top of plate (5) to be contacted with additional horizontal beams (11), is arranged in pairs in the wide clamping plate (3) of bracket (1) two sides
Horizontal pumping board (4), the bottom surface of the top surface for making additional horizontal beams (11) and horizontal pumping board (4) is in same level height, by horizontal pumping board
(4) inner opposite end, which is taken, to be set at the long side edge of additional horizontal beams (11), and overlap lateral ends are clipped in wide clamping plate (3),
Horizontal pumping boards (4) all at this time constitute two simulation working face coal seams of the intermediate groove for being separated with additional horizontal beams (11) formation, recessed
Trench bottom is the top surface exposed part of additional horizontal beams (11), according to the likelihood ratio of coal seam parameter by sand, calcium carbonate, gypsum and water
It is stirred, and mixture is filled up into groove, horizontal pumping board (4) and mixture is made to form a complete plane, further groove
Interior mixture simulates the coal column for staying and setting between two neighboring working face.
8. test method according to claim 6, it is characterised in that simulation single stope Exploitation research mining overburden fracture
When pattern and movement: control jack control vertical lift plate (5) falling head h1, relevant work face mining height is simulated, at this time mould
Quasi- mining height is height h1In addition horizontal pumping board (4) thickness of simulation floor undulation, by pairs of water since bracket one end
Flat pumping board (4) extracts same distance out to two sides respectively, if the horizontal pumping board (4) extracted out first to two sides is a plate and b plate, such as a plate
Extraction 1m, b plate extract 1m out outward outward, then simulating the single face width exploited under overlying strata is 2m, and second group of level is taken out
Plate (4) c plate and d plate extract identical distance out to two sides, and so on, until all horizontal pumping boards (4) exhaust, simulate under overlying strata
Width is that the single working face mining of 2m finishes.
9. test method according to claim 7, it is characterised in that simulated dual working face mining studies mining overburden fracture
When pattern and movement: plate (5) falling head h will be vertically moved up or down with jack2, the mining height simulated at this time is h2In addition horizontal take out
The thickness of plate (4) and additional horizontal beams (11) then successively takes out the horizontal pumping board (4) on same one side since bracket one end outward
Out, if the first two pieces horizontal pumping boards (4) extracted out outward first are a plate and c plate, if a plate extracts 1m out outward, i.e., under simulation overlying strata
The single face width of exploitation is 1m, then extracts c plate out 1m outward, and so on, until the horizontal pumping board on same one side is taken out
Complete, simulating width under overlying strata is that the single working face mining of 1m finishes, if preceding two pieces of horizontal pumping boards that another side is extracted out outward
(4) it is b plate and d plate, first extracts b plate out 1m outward, i.e., second face width exploited under simulation overlying strata is 1m, then by d
Plate extracts 1m out outward, and so on, until the horizontal pumping board of another side exhausts, simulating width under overlying strata is the two neighboring of 1m
Working face mining finishes.
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| CN1963148A (en) * | 2006-11-17 | 2007-05-16 | 中国矿业大学 | Water-protection coal-mining method using structural key layer as waterproof layer |
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